That's vaguely disturbing probably because it reminds me of the way the death eaters appeared in the Harry Potter series when Voldemort called them.
I wonder if there's a way to change the colors or put an effect on the intermediary frames to add a pop or a flash of color to cover over the oddities?
Here's a video I did recently using a whole bunch of them (https://www.youtube.com/watch?v=pTDxbmQxS_0&t=25s)